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pro vyhledávání: '"Choudhury T."'
Semi-numerical models of reionization typically involve a large number of unknown parameters whose values are constrained by comparing with observations. Increasingly often, exploring this parameter space using semi-numerical simulations can become c
Externí odkaz:
http://arxiv.org/abs/2311.04556
We present a computationally efficient and fast semi-numerical technique for simulating the Lyman-$\alpha$ (Ly$\alpha$) absorption optical depth in presence of neutral hydrogen "islands" left over from reionization at redshifts $5 \lesssim z \lesssim
Externí odkaz:
http://arxiv.org/abs/2003.08958
Akademický článek
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Autor:
Ghara, Raghunath, Choudhury, T. Roy
A possible way to study the reionization of cosmic hydrogen is by observing the large ionized regions (bubbles) around bright individual sources, e.g., quasars, using the redshifted 21 cm signal. It has already been shown that matched filter-based me
Externí odkaz:
http://arxiv.org/abs/1909.12317
We have investigated the long term average spectral properties of galactic X-ray binaries in the energy range of 3-20 keV, using long term monitoring data from MAXI -Gas Slit Camera (GSC). These long term average spectra are used to construct separat
Externí odkaz:
http://arxiv.org/abs/1905.10386
Autor:
Choudhury, T. Roy, Paranjape, Aseem
Semi-numerical models of the reionization of neutral hydrogen (HI) based on the excursion set (ES) approach are known to violate photon number conservation at the few per cent level. In this work, we highlight a more severe, previously unrecognized s
Externí odkaz:
http://arxiv.org/abs/1807.00836
Autor:
Ghara, Raghunath, Mellema, Garrelt, Giri, Sambit K., Choudhury, T. Roy, Datta, Kanan K., Majumdar, Suman
Three-dimensional radiative transfer simulations of the epoch of reionization can produce realistic results, but are computationally expensive. On the other hand, simulations relying on one-dimensional radiative transfer solutions are faster but limi
Externí odkaz:
http://arxiv.org/abs/1710.09397
Akademický článek
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Fractal dimensions can be used to characterize the clustering and lacunarities in density distributions. We use generalized fractal dimensions to study the neutral hydrogen distribution (HI) during the epoch of reionization. Using a semi-numeric mode
Externí odkaz:
http://arxiv.org/abs/1611.05554
Autor:
Datta, Kanan K., Ghara, Raghunath, Majumdar, Suman, Choudhury, T. Roy, Bharadwaj, Somnath, Roy, Himadri, Datta, Abhirup
Detection of individual luminous sources during the reionization epoch and cosmic dawn through their signatures in the HI 21-cm signal is one of the direct approaches to probe the epoch. Here, we summarize our previous works on this and present preli
Externí odkaz:
http://arxiv.org/abs/1610.08177